Hello! I joined the speedrunning community 3 months ago and currently, I did 3 runs, two any% runs (Frostrunner Icebreaker Any%, Henry Stickmin Collection Any% without PU) and Minecraft Classic reach bedrock. I'm looking to do more speedruns in the future and I'm wondering how I can become notified when one of my speedruns is broadcasted on a livestream.

Welcome to the community! Could you clarify what you mean by your last sentence? Random streamers generally don't take someone else's speedrun and show it off without permission, because among other reasons, that's violation of copyright.